It's time to nerd out over how a falling apple made space travel possible.
If you put your hand out of the window of a moving car, you can feel this force as your hand collides with molecules of air. It’s a backwards-pushing force that increases as the speed of an object increases. So when you drop objects on Earth, there are actuallyforces acting on them during the fall. Gravity pulls down, while air drag pushes up. An object’s mass-to-drag ratio affects how fast it falls.
But if you compare the tennis ball to something like a feather, the feather is very light relative to its size, and so air drag makes more difference. The air drag on the feather can counter the downward push of gravity enough that the feather won’t accelerate as it falls, which means it would land after the tennis ball.
to demonstrate this idea. The moon has gravity, but no air—and therefore no air drag. While standing on the surface of the moon, he dropped a hammer and a feather at the same time. Both hit the ground simultaneously. This showed that Aristotle was wrong, and Newton and Galileo were right:To make a relationship between a falling apple and the moon, let’s start with the fact that the moon circles the Earth over a period of close to 27 days.
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